const mongoose = require("mongoose");
module.exports = new Promise((resolve, reject) => {
    mongoose.connect("mongodb://localhost:27017/2022-9-29data", {
        useNewUrlParser: true,
        useUnifiedTopology: true,
        useCreateIndex: true
    })
    mongoose.connection.once("open", (err) => {
        if (!err) {
            console.log("服务器链接成功");
            resolve()
        } else {
            console.log(err)
            reject(err)
        }
    })
})